This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A022140 #18 Nov 18 2018 10:56:54
%S A022140 5,16,21,37,58,95,153,248,401,649,1050,1699,2749,4448,7197,11645,
%T A022140 18842,30487,49329,79816,129145,208961,338106,547067,885173,1432240,
%U A022140 2317413,3749653,6067066,9816719,15883785,25700504,41584289,67284793,108869082,176153875
%N A022140 Fibonacci sequence beginning 5, 16.
%H A022140 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>
%H A022140 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (1, 1).
%F A022140 G.f.: (5+11x)/(1-x-x^2). - _Philippe Deléham_, Nov 20 2008
%p A022140 a:= n-> (<<0|1>, <1|1>>^n. <<5, 16>>)[1,1]:
%p A022140 seq(a(n), n=0..50); # _Alois P. Heinz_, Nov 18 2018
%t A022140 a={};b=5;c=16;AppendTo[a, b];AppendTo[a, c];Do[b=b+c;AppendTo[a, b];c=b+c;AppendTo[a, c], {n, 4!}];a (* _Vladimir Joseph Stephan Orlovsky_, Sep 17 2008 *)
%t A022140 LinearRecurrence[{1,1},{5,16},40] (* _Harvey P. Dale_, Apr 29 2012 *)
%K A022140 nonn
%O A022140 0,1
%A A022140 _N. J. A. Sloane_